package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.poi.util.StringUtil;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /*
     * 营业额统计
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        //查询当前date日期对应的营业额数据，营业额是指：状态为“已完成”的订单金额合计
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //查询数据库表
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;//如果没有数据默认为null，此处给它设置上0.0
            turnoverList.add(turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtil.join(",", dateList))
                .turnoverList(StringUtil.join(",", turnoverList))
                .build();
    }

    /*
     * 用户统计
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的新增用户数
        List<Integer> newUserList = new ArrayList<>();
        //存放每天的总用户数
        List<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("end", endTime);
            //总用户数量
            Integer totalUser = userMapper.countByMap(map);
            totalUser = totalUser == null ? 0 : totalUser;

            map.put("begin", beginTime);
            //新增用户数量
            Integer newUser = userMapper.countByMap(map);
            newUser = newUser == null ? 0 : newUser;
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        //封装结果数据
        return UserReportVO.builder()
                .dateList(StringUtil.join(",", dateList))
                .totalUserList(StringUtil.join(",", totalUserList))
                .newUserList(StringUtil.join(",", newUserList))
                .build();
    }

    /*
     * 订单统计
     */
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }


        //存放每天订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //遍历dateList集合，查询每天的有效订单和订单总数
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);

            //查询每天的订单总数
            Integer orderCount = orderMapper.countByMap(map);
            orderCount = orderCount == null ? 0 : orderCount;

            //查询每天的有效订单数
            map.put("status", Orders.COMPLETED);
            Integer validOrderCount = orderMapper.countByMap(map);
            validOrderCount = validOrderCount == null ? 0 : validOrderCount;

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //时间区间内订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO
                .builder()
                .dateList(StringUtil.join(",", dateList))
                .orderCountList(StringUtil.join(",", orderCountList))
                .validOrderCountList(StringUtil.join(",", validOrderCountList))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /*
     * 销量排名top10
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        //菜品名集合
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtil.join(",", names);
        //菜品销量集合
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtil.join(",", numbers);

        //封装返回结果数据
        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /*
     * 导出运营数据报表
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库，获取营业数据——查询最近30天的营业数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
        //2.通过POI将数据写入Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        //基于模板文件创建一个新的Excel文件
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表个的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据——时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            //填充数据——第四行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //填充数据——第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i=0;i<30;i++){
                LocalDate date = dateBegin.plusDays(i);//设置三十天，每天查询每天的
                //查询每天的数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                //获得某一行——插入数据
                row = sheet.getRow(7 + i);
                //获取某个单元格
                row.getCell(1).setCellValue(date.toString());//日期
                row.getCell(2).setCellValue(businessData.getTurnover());//营业额
                row.getCell(3).setCellValue(businessData.getValidOrderCount());//有效订单数
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());//订单完成率
                row.getCell(5).setCellValue(businessData.getUnitPrice());//平均客单价
                row.getCell(6).setCellValue(businessData.getNewUsers());//新增用户数

            }

            //3.通过输出流将Excel文件下载到浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            out.close();
            excel.close();
            in.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }

}
